Safety gas valve



June 5, 1928.

I. L. SAUVEY ET AL SAFETY GAS VALVE gf/'/ a&'/)%w IrvmgLEauveg Samuel DEF a nca Patented June 5, 1928.

UNITED s'railuzs PATIENT omen."

SAFETY GAS VALVE.

Application filed'A'ugust 29, 1925. Serial No. 53,370.

This invention relates to safety gas valves.

In gas supply systems, it frequently happens that the gas pressure drops below asafe point for maintaining the burner in a lighted condition. The burner then becomes extinguished and upon subsequent, rise in pressure, the gas freely escapes into the house.

This invention is designed to overcome the above noted defects and Objects of such invention are to provide an automatic safety gas valve which will cut off gas when the pressure falls below a predetermined value.-

Further objects are to provide a safety gas valve which is of very simple and reliable construction, and which may be easily operated and cheaply manufactured.

An embodiment of the invention is shown in the accompanying drawings, in which Figure 1 is a vertical sectional view through the device.

Figure 2 is a sectional view on the line 2 2 of Figure 1.

, Figure 3 is a sectional view through the valve detached from the rest of the appa ratus.

The valve comprises a casing or cylinder 1 within which a lower valve seat 2 and an upper valve seat 3 are positioned. These valve seats have beveled faces and have central hubs apertured to receive the spindle 4 of the double faced valve 5.

'The central portion of the cylinder communicates with the inlet pipe 6 and the lower portion with the outlet pipe 7 The upper end of the casing is closed by means of an aperture cap 8 provided with a pet cock 9. The lower end of the casing is closed by means of a head or cap 10 through which a manually operable rod 11. slidably passes, suitable packing being provided to make a gas tight joint. .This rod is provided with a transverse pin 12 to prevent its withdrawal fromthe headand is provided with a manipulating knob or handle 13 at its lower end.

A convenient way of retaining the valve seats 2 and 3 inpostition is indicated in Figure 2, from which it will be seen that a pair of set screws 14 projects through the casing or cylinder 1 and engages the valve seats. It will be seen, therefore, that a very simple type of cylinder may be provided and that the valve seats may be'separa'tely formed and accurately positioned Within the cylinder in a simple and easy manner;

Preferably, the valve is made relatively light so that it may be held up with ease by I safe gas pressure, but which is of sufiicient weight so that it will drop down into cutoff position when the pressure falls below a predetermined point. 1

When the valve. is to be reset the rod 11 is pushed upwardly, thus raising the valve into contact with the upper seat 3.

The pet cock9 may be opened to relieve the back pressure above the valve during this operation. v

It will be seenthat a very simple and reliable type of safety gas valve has been pro vided which may be easily reset, and which may be cheaply manufactured.

It is to be noted particularly from reference to Figure 3 that the valve'has its'stems drilled out in order to reduce its weight, and further than this, the valve body is concave on its under side tov avoid I any unnecessary material.

responsive in action. I

Further, if desired, the upper and lower ends of the valve stemmay be notched which also reduces the weight slightly and'in addition prevents sticking. j I

It is to be noted that the valve seatsare removable from the cylinder anolmay be readily taken out and cleaned and replaced, if desired. In addition to this, by having them distinct and separate from the cylinder, it isapparent that the valve seats may be ground to the utmost accuracy independently of the cylinder.

This construction materially I I lightens the valve and makesit more quickly vAlthough the invention has been described in considerable detail, it is to be understood that the invention may be variously embodied and is, therefore, to be limited only as claimed.

We claim:

A safety gas valve comprising a cylinder I open at both ends,said cylinder being provided with an upper cap equipped with a pet cock and .a lower head, a manually slidable rod passing through said lower head, a airiof separate valve seats positioned Within said.

cylinderin spaced relation, said valve seats being removable from said cyl nder, means for locking said valve seats in position said cylinder having an entrance aperture between said valve seats and having an outlet aperture below the lower of said valve seats said valve seats having apertured hubs, and

a double faced valve adapted to cooperate with either of said seats and having a spindle freely guided by said hubs, the lower end of said spindle being adapted to abut the upper end of said rod when said rod is forced 10 upwardly.

In. testimony that We claim the fore-going we have hereunto set our hands at Green Bay, in the county of Brown and State of WVisc'onsizi.

IRVING L. SAUVEY. SAMUEL DE FRANCE. 

